how to keep image open

[manoj]

Is there a way to keep the image open, 

 

gdispImageOpenFile(&myImage, "spices.BMP");
gdispImageDraw(&myImage, 0, 0, 480, 272, 0, 0);

 

 

the image will be closed after the function is completed

[inmarket]

No, the image is not closed after drawing. You can redraw as many times as you like until either the image or the GFILE is explicitly closed. Have a look at the animated image demo which uses this to display sequential frames from a gif image.

[wctltya]

@inmarket, whether the file will be closed if the object is destroyed?

....
ghImage1 = gwinImageCreate(0, &wi.g);
gwinImageOpenFile(ghImage1, "ugfx_logo_banner.bmp");
...........

gwinDestroy(ghImage1); //Will this close the file "ugfx_logo_banner.bmp", i.e. will it release the resources?

and how to reuse the already opened image file in many image boxes widgets? For example: 

gdispImage myImage;
gdispImageOpenFile(&myImage, "myImage.gif");

then how to use it in multiple image boxes, for example ghImage1...ghImageN?

[inmarket]

From memory...

If you open the image using the filename in the gwin call it will automatically close the file handle when the gwinOmage object is destroyed. 

If you pass on already open GFILE to the gwin call I suspect the original file is not closed when you destroy the gwin object.

The final reference however is the source code. Once I get time later I will check if my memory is correct but have a check for yourself too.

[inmarket]

It looks like I got that wrong. It appears it always closes the file when the gwin object is destroyed.

This is not so nice. While it could be changed to match the behaviour above that is a change in existing behaviour so I am reluctant to do that before the next major version.

[wctltya]

Hi inmarket,

It's OK for me for now, as long as my app depends on that, i.e. that the all resources will be released on the image box destroying. Otherwise I'll  exceed the defined GFILE_MAX_GFILES.

But, I still don't understand how to use in an image box widget an already opened image file. Could you give me an example, please? Because, the only way I know to open an image file in an image widget is  

gwinImageOpenFile(ghImage, "image_file_name");

and really don't know how to display an already opened image in an image box widget.

[inmarket]

gwinImageOpenGFile

[Joel Bodenmann]

@inmarket is correct. The gwinImageOpenGFile() function takes a pointer to a GFILE. You can find the corresponding API reference here: http://api.ugfx.io/group___image_box.html#gab097ccfd4e1bcb9000ad5e563ff59ef3